Palumbo, 51, who has a history of mental illness, was arrested in March at the Juno Awards in Toronto, where Shain was being inducted into the Canadian Music Hall of Fame. After being discovered in the audience, he was charged with criminal harassment and violating a court order to stay 500 meters away from the singer.

Before Palumbo's outburst, Twain had testified that she was "disturbed" by the doctor's obsessive behavior, including a series of "very uncomfortable and personal" letters and visits to her home and brother-in-law's workplace. At one point, Twain said, said, she hired 24-hour security after the doctor was spotted repeatedly sitting in his parked car near her Ontario cottage.

Despite the Palumbo's apparent change of plea, the trial resumed after the outburst and is scheduled to continue tomorrow morning.

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